气候变化领域集成服务门户(CCPortal): Parameter Analysis and Estimates for the MODIS Evapotranspiration Algorithm and Multiscale Verification

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DOI	10.1029/2018WR023485
	Parameter Analysis and Estimates for the MODIS Evapotranspiration Algorithm and Multiscale Verification
	Zhang, Kun; Zhu, Gaofeng; Ma, Jinzhu; Yang, Yuting; Shang, Shasha; Gu, Chunjie
通讯作者	Ma, JZ (通讯作者)
发表日期	2019
ISSN	0043-1397
EISSN	1944-7973
起始页码	2211
结束页码	2231
卷号	55 期号:3
英文摘要	Accurate estimation of terrestrial evapotranspiration (E) is critical to understand the world's energy and water cycles. MOD16 is the core algorithm of the widely used global E data set (the Moderate Resolution Imaging Spectroradiometer [MODIS] E product). However, it exhibits considerable uncertainties in some regions. Based on the data from 175 flux towers, we identified the key parameters of the MOD16 algorithm using the Sobol' sensitivity analysis method across biomes. The output of the MOD16 algorithm was sensitive to eight parameters. Among them, beta, which is treated as a constant (0.2 kPa) across biomes in the original MOD16 algorithm, was identified as the parameter to which the algorithm was most sensitive. We used the differential-evolution Markov chain method to obtain the proper posterior distributions for each key parameter across a range of biomes. The values of the key parameters for the different biomes were accurately estimated by differential-evolution Markov chain in comparison with data from the flux towers. We then evaluated the performances of the original MOD16 and the optimized MOD16 and compared them at multiple spatial scales (i.e., site, catchment, and global). We obtained relatively consistent and more reliable E simulations using the optimized MOD16 at all three scales. In the future, more attention should be paid to uncertainties in the algorithm's structure and its parameterizations of soil moisture constraint, canopy resistance, and energy partitioning.
关键词	GLOBAL SENSITIVITY-ANALYSIS WACMOS-ET PROJECT EDDY-COVARIANCE ENERGY-BALANCE DIFFERENTIAL EVOLUTION RAINFALL INTERCEPTION HYDROLOGICAL MODEL LAND EVAPORATION RIVER-BASIN FLUX TOWER
英文关键词	terrestrial evapotranspiration; Sobol' sensitivity analysis; DE-MC optimization; multiscale evaluation
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources
WOS类目	Environmental Sciences ; Limnology ; Water Resources
WOS记录号	WOS:000464660000024
来源期刊	WATER RESOURCES RESEARCH
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259459
推荐引用方式 GB/T 7714	Zhang, Kun,Zhu, Gaofeng,Ma, Jinzhu,et al. Parameter Analysis and Estimates for the MODIS Evapotranspiration Algorithm and Multiscale Verification[J]. 中国科学院青藏高原研究所,2019,55(3).
APA	Zhang, Kun,Zhu, Gaofeng,Ma, Jinzhu,Yang, Yuting,Shang, Shasha,&Gu, Chunjie.(2019).Parameter Analysis and Estimates for the MODIS Evapotranspiration Algorithm and Multiscale Verification.WATER RESOURCES RESEARCH,55(3).
MLA	Zhang, Kun,et al."Parameter Analysis and Estimates for the MODIS Evapotranspiration Algorithm and Multiscale Verification".WATER RESOURCES RESEARCH 55.3(2019).